/**
 * 
 */
package com.itboye.allshengmedical.sci;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.example.allshengmedical.util.ByExceptionUtil;

import android.util.Log;

/**
 * @author 贝贝 346551990@qq.com
 * @date   2016-12-8 
 */
public class SerialPort {
	 
	
	/*
	 * Do not remove or rename the field mFd: it is used by native method close();
	 */
	private FileDescriptor mFd;
	private FileInputStream mFileInputStream;
	private FileOutputStream mFileOutputStream;	
	
	public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException {
		/*
		 * Check access permission 
		 * 检查访问权限
		 *
		 **/
		if (!device.canRead() || !device.canWrite()) {
			try {
				/* Missing read/write permission, trying to chmod the file */
				Process su;
				su = Runtime.getRuntime().exec("/system/bin/su");
				String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
						+ "exit\n";
				su.getOutputStream().write(cmd.getBytes());
				if ((su.waitFor() != 0) || !device.canRead()
						|| !device.canWrite()) {
					throw new SecurityException();
				}
			} catch (Exception e) {
				ByExceptionUtil.log(e);
				throw new SecurityException();
			}
		}

		mFd = open(device.getAbsolutePath(), baudrate, flags);
		if (mFd == null) {
			Log.e(this.getClass().getName(), "native open returns null");
			throw new IOException();
		}
		
		mFileInputStream = new FileInputStream(mFd);
		mFileOutputStream = new FileOutputStream(mFd);
	}

	// Getters and setters
	public InputStream getInputStream() {
		return mFileInputStream;
	}

	public OutputStream getOutputStream() {
		return mFileOutputStream;
	}

	 private native static FileDescriptor open(String path, int baudrate, int flags);  
	 public native void close();  
	 static {  
	      System.loadLibrary("AllShengMedical");  
	 }


}
